Teach our Azure Pipeline to build and test also using MSVC

[dscho]

We are very close to contributing Git for Windows' MSVC patches to the Git mailing list (gitgitgadget#149), and we should really have a test first, to make sure that we got it right, and also to keep it working once it is in core Git's master.

To that end, I already added a job that builds the vcpkg dependencies and offers them as a build artifact (no sense trying to rebuild those dependencies every single time we want to build & test Git...): https://dev.azure.com/git/git/_build?definitionId=9

[PhilipOakley]

This has been sitting awhile in my todo/inbox. Finally got around to trying to get VS2017 installed and this checked (so I can do the #1848 et al 4Gb issue(s,s,s,s) looked at, hopefully with a bit of intellisense... 😉

However I got "invalid numeric argument '/Werror'" for fuzz-commit-graph.o, which I suspect is a new fault in the fuzz code..

phili@Philip-Win10 MINGW64 /usr/src/git (gfw-master)
$ make -j15 install
GIT_VERSION = 2.21.0.windows.1.80.gdc2ae9a382
[...]
phili@Philip-Win10 MINGW64 /usr/src/git (gfw-master)
$ make MSVC=1
Fetching vcpkg in C:\git-sdk-64\usr\src\git\compat\vcbuild\vcpkg
Cloning into 'vcpkg'...
remote: Enumerating objects: 43, done.
remote: Counting objects: 100% (43/43), done.
remote: Compressing objects: 100% (33/33), done.
remote: Total 57083 (delta 14), reused 31 (delta 10), pack-reused 57040
Receiving objects: 100% (57083/57083), 13.59 MiB | 1.67 MiB/s, done.
Resolving deltas: 100% (36731/36731), done.
Checking out files: 100% (3174/3174), done.
Building vcpkg

Building vcpkg.exe ...

  pch.cpp
[...]
Elapsed time for package curl:x64-windows: 1.4 min

Total elapsed time: 1.4 min

The package curl is compatible with built-in CMake targets:

    find_package(CURL REQUIRED)
    target_link_libraries(main PRIVATE ${CURL_LIBRARIES})
    target_include_directories(main PRIVATE ${CURL_INCLUDE_DIRS})

    Finished curl
    * new build flags
    CC fuzz-commit-graph.o
cl : Command line error D8021 : invalid numeric argument '/Werror'
make: *** [Makefile:2349: fuzz-commit-graph.o] Error 1

phili@Philip-Win10 MINGW64 /usr/src/git (gfw-master)
$ git status
On branch gfw-master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean

phili@Philip-Win10 MINGW64 /usr/src/git (gfw-master)
$ git log -1
commit dc2ae9a38264da2af13b0f95cc4fa5eee2ebf893 (HEAD -> gfw-master, origin/master)
Merge: eb5d06f545 66af0b6eb8
Author: Johannes Schindelin <johannes.schindelin@gmail.com>
Date:   Mon Mar 11 19:58:29 2019 +0100

    Merge pull request #2119 from dscho/update-stash-to-current

    Update the built-in `git stash` to the latest version

phili@Philip-Win10 MINGW64 /usr/src/git (gfw-master)

I was hoping to get to try out the new VS stuff, but I'm not there yet.

[PhilipOakley]

looks like this is a makefile error in that fuzz-commit-graph is not filtered out of L2349 (2nd line below)

$(C_OBJ): %.o: %.c GIT-CFLAGS $(missing_dep_dirs)
     $(QUIET_CC)$(CC) -o $*.o -c $(dep_args) $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $<

where C_OBJ := $(filter-out $(ASM_OBJ),$(OBJECTS)) so maybe this special case also needs filtered for the MSVC case (I think the fuzz compilation is noop/not-used for the linux case, and has a special/newish .PHONY: fuzz-all at the end of the Makefile).

[PhilipOakley]

the FUZZ_OBJ are defined at https://github.com/git-for-windows/git/blob/master/Makefile#L703-L710 but are then included in the OBJECTS list at https://github.com/git-for-windows/git/blob/master/Makefile#L2314-L2319 so will still need to resolve the MSVC compiler flags problem (eventually).

Eventually just went with make CFLAGS="" MSVC=1 just to get something compiling (in progress).
.. spotted some warnings

    LINK git-imap-send.exe
LINK : warning LNK4044: unrecognized option '/lnghttp2'; ignored
LINK : warning LNK4044: unrecognized option '/lidn2'; ignored
LINK : warning LNK4044: unrecognized option '/lgdi32'; ignored
LINK : warning LNK4044: unrecognized option '/lcrypt32'; ignored
LINK : warning LNK4044: unrecognized option '/lwldap32'; ignored
LINK : warning LNK4044: unrecognized option '/lws2_32'; ignored

so still steps to go.

[dscho]

Let's close this in favor of #2148

[dscho]

However I got "invalid numeric argument '/Werror'" for fuzz-commit-graph.o, which I suspect is a new fault in the fuzz code..

Yeah, I forgot to take care of DEVELOPER=1. Sorry for that... See #2148 for details how I addressed this.

looks like this is a makefile error in that fuzz-commit-graph is not filtered out

No, it needs to be compiled in...

LINK git-imap-send.exe

LINK : warning LNK4044: unrecognized option '/lnghttp2'; ignored
LINK : warning LNK4044: unrecognized option '/lidn2'; ignored
LINK : warning LNK4044: unrecognized option '/lgdi32'; ignored
LINK : warning LNK4044: unrecognized option '/lcrypt32'; ignored
LINK : warning LNK4044: unrecognized option '/lwldap32'; ignored
LINK : warning LNK4044: unrecognized option '/lws2_32'; ignored

I addressed that as part of the commit that adds support for MSVC=1 DEVELOPER=1.